CN106595112B - Solar heat-preservation type Two-stage Compression air source heat pump system and its operation method - Google Patents
Solar heat-preservation type Two-stage Compression air source heat pump system and its operation method Download PDFInfo
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- CN106595112B CN106595112B CN201611133141.6A CN201611133141A CN106595112B CN 106595112 B CN106595112 B CN 106595112B CN 201611133141 A CN201611133141 A CN 201611133141A CN 106595112 B CN106595112 B CN 106595112B
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- solenoid valve
- valve
- pressure compressor
- refrigerant
- way reversing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
Abstract
The present invention relates to art of heat pumps, it is a kind of solar heat-preservation type Two-stage Compression air source heat pump system, including two variable conpacitance compressors, two outdoor heat exchangers, flash vessel, electric expansion valve, hot water storage tanks, its main feature is that, system has refrigeration and heating operation mode, there are independent, in parallel and three kinds of compression methods of operation of two-stage under two kinds of operational modes, two outdoor heat exchanger parallel configurations in system, and hot gas bypass circulation and solar heat-storing device between grade are set, cooperate with solenoid valve, check valve, constitutes the defrosting circulation of continuously heating.The invention has the advantages that the system is during refrigeration, heating and defrosting, compressor capacity is adjustable, solar heat-storing device makes refrigerant superheat, and outdoor heat exchanger parallel configuration alternately defrosts, and realizes system under microthermal climate smoothly to indoor offer heat.The system uses in cold district room, has extensive popularization and application space and energy-saving significance.
Description
Technical field
The invention belongs to art of heat pumps, specifically, being a kind of solar heat-preservation type Two-stage Compression air source heat pump system
And its operation method.
Background technique
When existing air source heat pump is run at low ambient temperatures, drastically reduced there is heating capacity and compressor air-discharging
The problems such as temperature is excessively high；Meanwhile when environment temperature is lower than 0 DEG C, outdoor heat exchanger surface will will appear large area frost,
Lead to the degradation of heat exchange performance of outdoor heat exchange equipment, and the synthesis heating performance of heat pump assembly is produced bigger effect.Currently,
Air source heat pump in terms of heating capacity decline, mostly uses varying capacity and (standard) Two-stage Compression technology to be changed at low ambient temperatures
It is kind.Wherein variable capacity technology can effectively promote the heating capacity of the low temperature environment of heat pump assembly, but the excessive discharge temperature of system
The determination of compressor capacity is to be resolved under the conditions of problem and heating season full working scope；For (standard) Two-stage Compression technology, with sky
Air supply heat pump combines, and can well solve heat pump system low temperature adaptability problem, through retrieval find: " one kind set economizer and
It is empty that the two-stage compression heat pump system to be defrosted using hot-gas bypass method " (application number CN201320180824.2) discloses a kind of winter
The air-conditioning device of air supply heat pump.The device only proposes to improve hot pump in low temp system using two-stage compression cycle reduction compression ratio
Efficiency, the device is not exclusively cooling using the throttling of intercooler realization level-one, centre, although inhibiting in throttling process in vain
The generation of quantity of steam, but increases irreversible loss.The device solves outside air temperature at 0 DEG C or less using hiigh pressure stage hot-gas bypass
Outdoor heat exchange device defrosting problem can not carry out capacity regulating in defrosting, and refrigeration system is run under optimum condition, is removed
Gas-liquid mixed refrigerant is largely subcooled after frost and easily enters compressor, not only causes compressor displacement smaller and fortune to compressor
Row safety generates threat.In order to guarantee system stable operation, need to propose effectively Defrost method and control strategy.For sky
The defrosting of air supply heat pump, two kinds of hot gas defrosting methods of current main inverse defrosting and hot gas bypass defrosting.For double stage heat pump
For compressibility, using inverse defrosting, the hiigh pressure stage, intergrade and low-pressure stage pressure change before and after system defrosting are larger, lead
It is longer that cause system restores the stable cycle of operation again, while because of system structure characteristic, the system stability for the process that defrosts is poor,
Therefore inverse defrosting is dfficult to apply to Two-stage Compression system；For hot gas bypass defrosting, double stage heat pump compression heat pump system is usually adopted
It is defrosted with high pressure stage compressor exhaust bypass, the method defrosts process not only to room temperature and human thermal comfort generation shadow
It rings, and system coefficient of performance in heating is lower；During defrosting simultaneously, system high and low pressure compressor is difficult to carry out reasonable capacity
It adjusts.In addition, the refrigerant in defrosting circulation bypass circulation flows directly into low pressure from outdoor heat exchanger at the end of system defrosting
Compressor air suction mouth, the state because refrigerant temperature is lower, and in two-phase or supercooling, causes a large amount of liquid refrigerants to enter pressure
Contracting machine, to the biggish damage of the generation of compressor；In addition, solar water heater is in as the equipment for providing domestic hot-water at present
It has been widely used in front yard, but purposes is single, can not yet give full play to its function.So far, related solar heat-preservation is had no
The document report and practical application of type Two-stage Compression air source heat pump system and its operation method.
Summary of the invention
It is an object of that present invention to provide a kind of solar heat-preservation type Two-stage Compression air source heat pump systems, it is using heat between grade
The defrosting of gas bypass plus solar heat-preservation, defrosting speed is fast, and defrosting time is short, can uninterruptedly heat supply defrost, ensure that user
The comfort used, and can be avoided the endless refrigerant of evaporation and enter compressor adverse effect caused by compressor.And it mentions
For scientific and reasonable, the good operation method of effect, to realize under difficult environmental conditions, the efficient fortune of the system various modes
Row.
Realize the object of the invention use technical solution first is that: a kind of solar heat-preservation type Two-stage Compression air source heat pump
System, including low pressure compressor 1, high pressure compressor 2, flash vessel 3, indoor heat exchanger 4, four-way reversing valve 7, the first electronic expansion
Valve 8, the second electric expansion valve 9, the first solenoid valve 12, the 13rd solenoid valve 24, the 14th solenoid valve 25, the first check valve 26,
Second one-way valve 27, third check valve 28, the 4th check valve 29, characterized in that further include by the first outdoor heat exchanger 5, second
Outdoor heat exchanger 6, the first capillary 10, the second capillary 11, second solenoid valve 13, third solenoid valve 14, the 4th solenoid valve 15,
5th solenoid valve 16, the 6th solenoid valve 17, the 7th solenoid valve 18, the 8th solenoid valve 19, the 9th solenoid valve 20, the tenth solenoid valve
21, the 11st solenoid valve 22, the 12nd solenoid valve 23 and connecting refrigerant lines are constituted refrigerant circulation loop A and by accumulation of heat water
Case 30, solar thermal collector 31, water pump 32, cold water fill into the solar energy collection that mouth 33, hot water outlet 34 and water route connecting tube are constituted
Heat, accumulation of heat water-flow circuit B；The connection structure of the refrigerant circulation loop A is 1 upper end refrigerant pipe of low pressure compressor
The first check valve of road 26 is connected with the end a of four-way reversing valve 7, and 1 lower end refrigerant line of low pressure compressor is through second one-way valve
27 are connected with the end c of four-way reversing valve 7, and the end the b refrigerant line of four-way reversing valve 7 is connected with 4 upper port of indoor heat exchanger,
4 lower port refrigerant line of indoor heat exchanger is connected to the 9th solenoid valve through the 14th solenoid valve 25, the second electric expansion valve 9
20, the tenth solenoid valve 21 is connected in the middle part e point of refrigerant line, refrigerant line warp on the left of the middle part e point of refrigerant line
9th solenoid valve 20 is connected with 5 lower end of the first outdoor heat exchanger, on the right side of the middle part e point of refrigerant line through the tenth solenoid valve 21 with
Second outdoor heat exchanger, 6 lower end is connected, and the 5th solenoid valve 16 of 5 top of the first outdoor heat exchanger is connected to the 5th solenoid valve 16 and the
Seven solenoid valves 18 are connected in the middle part f point of refrigerant line, and the 7th solenoid valve 18 of 6 top of the second outdoor heat exchanger is connected to refrigeration
The middle part f point of agent pipeline, the middle part f point of refrigerant line are connected to the end d of four-way reversing valve 7, high pressure pressure through second solenoid valve 13
2 upper end refrigerant line of contracting machine is connected on the pipeline that the first check valve 26 is connected with the end a of four-way reversing valve 7, high pressure compressor 2
Lower end refrigerant line is connected to the refrigerant pipe that second one-way valve 27 is connected with the end c of four-way reversing valve 7 through third check valve 28
On the road, 3 upper end refrigerant line of flash vessel is connected to high pressure compressor 2 and third through the 13rd solenoid valve 24, the 4th check valve 29
The connected refrigerant line of check valve 28gPoint, 3 right end refrigerant line of flash vessel through the first electric expansion valve 8, be connected to interior
The refrigerant pipe road that heat exchanger 4 is connected with the 14th solenoid valve 25,3 lower left quarter refrigerant line of flash vessel are connected to the 14th electricity
The connected refrigerant pipe road of magnet valve 25, the second electric expansion valve 9,12 upper end refrigerant line of the first solenoid valve are connected to low pressure pressure
The refrigerant line that contracting machine 1 is connected with the first check valve 26hPoint, 12 lower end refrigerant line of the first solenoid valve are connected to high pressure pressure
The refrigerant line that contracting machine 2 is connected with third check valve 28iPoint, 19 right end of the 8th solenoid valve are connected to the second outdoor heat exchanger 6
The refrigerant pipe road that upper end is connected with the 7th solenoid valve 18,19 the first capillary of left end 10 of the 8th solenoid valve are connected to the 7th electricity
The middle part of magnet valve 18 and refrigerant linefThe connected refrigerant pipe road of point, 17 left end of the 6th solenoid valve is connected to the 5th solenoid valve
The 16 refrigerant pipe roads being connected with 5 top of the first outdoor heat exchanger, 17 right end of the 6th solenoid valve are connected to through the second capillary 11
The middle part of 5th solenoid valve 16 and refrigerant linefThe connected refrigerant pipe road of point, 22 left end of the 11st solenoid valve are connected to the
The refrigerant pipe road that one outdoor heat exchanger 5 is connected with the 9th solenoid valve 20,22 right end of the 11st solenoid valve are connected to low pressure compression
Machine 1 is connected refrigerant line with the first check valve 26jPoint, 23 left end of the 12nd solenoid valve be connected to the second outdoor heat exchanger 6 with
Tenth solenoid valve 21 is connected refrigerant pipe on the road, and 23 right end of the 12nd solenoid valve is connected to the 11st solenoid valve 22 and low pressure compressor
1 connected refrigerant pipe road, 14 left end of third solenoid valve are connected to 30 upper right side of hot water storage tank, and 14 right end of third solenoid valve is connected to the
The refrigerant pipe road that two solenoid valves 13 are connected with the end d of four-way reversing valve 7,15 left end of the 4th solenoid valve is connected to hot water storage tank 30
Lower-left end, 15 right end of the 4th solenoid valve are connected to the middle part of second solenoid valve 13 Yu refrigerant linefThe connected refrigerant pipe road of point；
The connection structure of the solar energy heating, accumulation of heat water-flow circuit B is: 31 left end of solar thermal collector is through water pump 32 and accumulation of heat
The lower-left end of water tank 30 is connected, and 31 right end of solar thermal collector is connected with 30 left upper end of hot water storage tank, and cold water fills into mouth 33 and stores
30 lower part of boiler is connected, and hot water outlet 34 is connected with 30 top of hot water storage tank.
The low pressure compressor 1 and high pressure compressor 2 is frequency conversion or variable conpacitance compressor.
6 parallel configuration of first outdoor heat exchanger 5 and the second outdoor heat exchanger.
Realize the object of the invention use technical solution second is that: a kind of solar heat-preservation type Two-stage Compression air source heat pump
The operation method of system, characterized in that carrying out practically content are as follows:
1) low pressure compressor separate refrigeration recycles: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four-way
The end a of reversal valve 7 and d termination are led to, and the end b of four-way reversing valve 7 and c termination are logical, and low pressure compressor 1 is powered runs, high pressure compressed
2 no power of machine, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve
20, the tenth solenoid valve 21 and the 14th solenoid valve 25, which are powered, opens；
2) high pressure compressor separate refrigeration recycles: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four-way
The end a of reversal valve 7 and d termination are logical, and the end b of four-way reversing valve 7 and c termination are logical, 1 no power of low pressure compressor, high pressure compressor 2
Be powered operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Tenth solenoid valve 21 and the 14th solenoid valve 25, which are powered, to be opened；
3) low pressure compressor individually heats circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four-way changes
Lead to the end a of valve 7 and b termination, the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 is powered runs, high pressure compressor 2
No power, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Ten solenoid valves 21 and the 14th solenoid valve 25, which are powered, to be opened；
4) high pressure compressor individually heats circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four-way changes
Logical to the end a of valve 7 and b termination, the end c of four-way reversing valve 7 and d termination are logical, 1 no power of low pressure compressor, and high pressure compressor 2 is logical
Electricity operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Ten solenoid valves 21 and the 14th solenoid valve 25, which are powered, to be opened；
5) high and low pressure compressor parallel refrigeration cycle: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four
The end a of logical reversal valve 7 and d termination are logical, and the end b of four-way reversing valve 7 and c termination are logical, and low pressure compressor 1 and high pressure compressor 2 are logical
Electricity operation, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20, the tenth solenoid valve 21 and the tenth
Four solenoid valves 25, which are powered, to be opened；
6) high and low pressure compressor parallel heating circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, four-way
The end a of reversal valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are powered
Operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve the 20, the tenth
Solenoid valve 21 and the 14th solenoid valve 25, which are powered, to be opened；
7) Two-stage Compression heating circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, four-way reversing valve 7
The end a and b termination are led to, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are powered and run, and first
Electric expansion valve 8, the second electric expansion valve 9, the first solenoid valve 12, second solenoid valve 13, the 5th solenoid valve 16, the 6th solenoid valve
18, the 9th solenoid valve 20, the tenth solenoid valve 21 and the 13rd solenoid valve 24, which are powered, opens；
8) heating of high and low pressure compressor parallel mode-defrosting circulation: the four-way commutation of the refrigerant circulation loop A
Valve 7 is powered, and the end a of four-way reversing valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, low pressure compressor 1 and high pressure
Compressor 2, which is powered, to be run, the second electric expansion valve 9, third solenoid valve 14, the 4th solenoid valve 15, the 16, the 8th electricity of the 5th solenoid valve
Magnet valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 14th solenoid valve 25, which are powered, to be opened；
9) heating of low pressure compressor isolated operation mode-defrosting circulation: the four-way commutation of the refrigerant circulation loop A
Valve 7 is powered, and the end a of four-way reversing valve 7 and b termination are led to, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 is powered transports
Row, 2 no power of high pressure compressor, the second electric expansion valve 9, third solenoid valve 14, the 4th solenoid valve 15, the 5th solenoid valve 16,
8th solenoid valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 14th solenoid valve 25, which are powered, to be opened；
10) Two-stage Compression mode heating-defrosting circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four
The end a of logical reversal valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are logical
Electricity operation, the first electric expansion valve 8, the second electric expansion valve 9, the first solenoid valve 12, third solenoid valve 14, the 4th solenoid valve
15, the 5th solenoid valve 16, the 8th solenoid valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 13rd solenoid valve 24 are powered
It opens.
A kind of effect of solar heat-preservation type Two-stage Compression air source heat pump system of the present invention is: high and low due to using
Two compressors and flasher are pressed to realize the throttling of refrigerant two-stage, intermediate not exclusively cooling two-stage compression heat pump circulation,
Hot gas bypass can make system in -15 DEG C of low temperature environment except defrosting system is plus solar heat-preservation between the unique grade of system
Stabilization, reliably longtime running, provide the coefficient of performance in heating of enough heating capacities and minimum 2.0, meet cold district winter
Heating requirement.System of the invention simultaneously can still carry out capacity regulating in defrosting, and system is made to keep higher COP；Refrigeration
Agent and solar heat-storing device heat exchange make the refrigerant superheat into compressor, guarantee to improve while compressor safe operation
Compressor displacement, and then heat pump system 10 ~ 30% heating capacities of raising can be made, heat pump system Energy Efficiency Ratio raising 5 ~ 10%, meanwhile, lead to
The solenoid valve opening and closing and the cooperation of check valve for crossing low pressure exhaust outlet of compressor and high pressure compressor air entry, may be implemented a variety of
Operation method, air source heat pump heating system and the device defrosting time for compensating for the application of original cold district be long, is after defrosting
System restores the technical deficiencies such as heating time length, realizes uninterrupted heat supply defrosting, takes full advantage of resource and the energy, meet user
Multi-functional demand, expanded application range, system of the invention be widely applied can in cold district room, had very big
Popularization space and energy-saving significance.
Detailed description of the invention
Fig. 1 is a kind of solar heat-preservation type Two-stage Compression air source heat pump system structural schematic diagram of the invention.
In figure: 1 low pressure compressor, 2 high pressure compressors, 3 flash vessels, 4 indoor heat exchangers, 5 first outdoor heat exchangers, 6
Two outdoor heat exchangers, 7 four-way reversing valves, 8 first electric expansion valves, 9 second electric expansion valves, 10 first capillaries, 11 second
Capillary, 12 first solenoid valves, 13 second solenoid valves, 14 third solenoid valves, 15 the 4th solenoid valves, 16 the 5th solenoid valves, 17
Six solenoid valves, 18 the 7th solenoid valves, 19 the 8th solenoid valves, 20 the 9th solenoid valves, 21 the tenth solenoid valves, 22 the 11st solenoid valves,
23 the 12nd solenoid valves, 24 the 13rd solenoid valves, 25 the 14th solenoid valves, 26 first check valves, 27 second one-way valves, 28 thirds
Check valve, 29 the 4th check valves, 30 hot water storage tanks, 31 solar thermal collectors, 32 water pumps, 33 cold water fill into mouth, 34 hot water outlets,
Refrigerant circulation loop A, solar energy heating, accumulation of heat water-flow circuit B.
Specific embodiment
Below with drawings and examples, the invention will be further described.
Referring to Fig.1, a kind of solar heat-preservation type Two-stage Compression air source heat pump system of the invention, including low pressure compressor
1, high pressure compressor 2, flash vessel 3, indoor heat exchanger 4, four-way reversing valve 7, the first electric expansion valve 8, the second electric expansion valve
9, the first solenoid valve 12, the 13rd solenoid valve 24, the 14th solenoid valve 25, the first check valve 26, second one-way valve 27, third list
It further include by the first outdoor heat exchanger 5, the second outdoor heat exchanger 6, the first capillary 10, second to valve 28, the 4th check valve 29
Capillary 11, second solenoid valve 13, third solenoid valve 14, the 4th solenoid valve 15, the 5th solenoid valve 16, the 6th solenoid valve 17,
Seven solenoid valves 18, the 8th solenoid valve 19, the 9th solenoid valve 20, the tenth solenoid valve 21, the 11st solenoid valve 22, the 12nd solenoid valve
The 23 and refrigerant circulation loop A that constitutes of connecting refrigerant lines and by hot water storage tank 30, solar thermal collector 31, water pump 32, cold
Water fills into solar energy heating, the accumulation of heat water-flow circuit B that mouth 33, hot water outlet 34 and water route connecting tube are constituted.The low pressure
Compressor 1 and high pressure compressor 2 are frequency conversion or variable conpacitance compressor.It is changed outside first outdoor heat exchanger 5 and second Room
Hot 6 parallel configuration of device.The connection structure of the refrigerant circulation loop A is that 1 upper end refrigerant line of low pressure compressor is through
One check valve 26 is connected with the end a of four-way reversing valve 7, and 1 lower end refrigerant line of low pressure compressor is through second one-way valve 27 and four
The end c of logical reversal valve 7 is connected, and the end the b refrigerant line of four-way reversing valve 7 is connected with 4 upper port of indoor heat exchanger, and interior is changed
Hot 4 lower port refrigerant line of device is connected to the 9th solenoid valve 20, through the 14th solenoid valve 25, the second electric expansion valve 9
Ten solenoid valves 21 are connected in the middle part e point of refrigerant line, and refrigerant line is through the 9th electricity on the left of the middle part e point of refrigerant line
Magnet valve 20 is connected with 5 lower end of the first outdoor heat exchanger, through the tenth solenoid valve 21 and second Room on the right side of the middle part e point of refrigerant line
6 lower end of external heat exchanger is connected, and the 5th solenoid valve 16 of 5 top of the first outdoor heat exchanger is connected to the 5th solenoid valve 16 and the 7th electromagnetism
Valve 18 is connected in the middle part f point of refrigerant line, and the 7th solenoid valve 18 of 6 top of the second outdoor heat exchanger is connected to refrigerant line
Middle part f point, the middle part f point of refrigerant line is connected to the end d of four-way reversing valve 7 through second solenoid valve 13, on high pressure compressor 2
End refrigerant line is connected on the pipeline that the first check valve 26 is connected with the end a of four-way reversing valve 7,2 lower end system of high pressure compressor
Refrigerant circuit is connected to the refrigerant pipe road that second one-way valve 27 is connected with the end c of four-way reversing valve 7 through third check valve 28, dodges
3 upper end refrigerant line of steaming device is connected to high pressure compressor 2 and third check valve 28 through the 13rd solenoid valve 24, the 4th check valve 29
Connected refrigerant linegPoint, 3 right end refrigerant line of flash vessel through the first electric expansion valve 8, be connected to indoor heat exchanger 4
Be connected with the 14th solenoid valve 25 refrigerant pipe road, 3 lower left quarter refrigerant line of flash vessel be connected to the 14th solenoid valve 25,
The connected refrigerant pipe road of second electric expansion valve 9,12 upper end refrigerant line of the first solenoid valve be connected to low pressure compressor 1 with
The connected refrigerant line of first check valve 26hPoint, 12 lower end refrigerant line of the first solenoid valve be connected to high pressure compressor 2 with
The connected refrigerant line of third check valve 28iPoint, 19 right end of the 8th solenoid valve are connected to 6 upper end of the second outdoor heat exchanger and
The connected refrigerant pipe road of seven solenoid valves 18,19 the first capillary of left end 10 of the 8th solenoid valve be connected to the 7th solenoid valve 18 with
The middle part of refrigerant linefThe connected refrigerant pipe road of point, 17 left end of the 6th solenoid valve is connected to the 5th solenoid valve 16 and first
The connected refrigerant pipe road in 5 top of outdoor heat exchanger, 17 right end of the 6th solenoid valve are connected to the 5th electromagnetism through the second capillary 11
The middle part of valve 16 and refrigerant linefThe connected refrigerant pipe road of point, 22 left end of the 11st solenoid valve is connected to the first outdoor and changes
The refrigerant pipe road that hot device 5 is connected with the 9th solenoid valve 20,22 right end of the 11st solenoid valve are connected to low pressure compressor 1 and first
Check valve 26 is connected refrigerant linejPoint, 23 left end of the 12nd solenoid valve are connected to the second outdoor heat exchanger 6 and the tenth solenoid valve
21 connected refrigerant pipes roads, 23 right end of the 12nd solenoid valve are connected to the 11st solenoid valve 22 and are connected with low pressure compressor 1 refrigeration
On agent pipeline, 14 left end of third solenoid valve is connected to 30 upper right side of hot water storage tank, and 14 right end of third solenoid valve is connected to second solenoid valve
The 13 refrigerant pipe roads being connected with the end d of four-way reversing valve 7,15 left end of the 4th solenoid valve are connected to 30 lower-left end of hot water storage tank,
4th solenoid valve, 15 right end is connected to the middle part of second solenoid valve 13 Yu refrigerant linefThe connected refrigerant pipe road of point；Described
Solar energy heating, accumulation of heat water-flow circuit B connection structure be: 31 left end of solar thermal collector is through water pump 32 and hot water storage tank 30
Lower-left end be connected, 31 right end of solar thermal collector is connected with 30 left upper end of hot water storage tank, and cold water fills into mouth 33 and hot water storage tank
30 lower parts are connected, and hot water outlet 34 is connected with 30 top of hot water storage tank.
A kind of particular content of the operation method of solar heat-preservation type Two-stage Compression air source heat pump system of the present invention are as follows:
1) low pressure compressor separate refrigeration recycles: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four-way
The end a of reversal valve 7 and d termination are led to, and the end b of four-way reversing valve 7 and c termination are logical, and low pressure compressor 1 is powered runs, high pressure compressed
2 no power of machine, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve
20, the tenth solenoid valve 21 and the 14th solenoid valve 25, which are powered, opens；
2) high pressure compressor separate refrigeration recycles: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four-way
The end a of reversal valve 7 and d termination are logical, and the end b of four-way reversing valve 7 and c termination are logical, 1 no power of low pressure compressor, high pressure compressor 2
Be powered operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Tenth solenoid valve 21 and the 14th solenoid valve 25, which are powered, to be opened；
3) low pressure compressor individually heats circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four-way changes
Lead to the end a of valve 7 and b termination, the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 is powered runs, high pressure compressor 2
No power, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Ten solenoid valves 21 and the 14th solenoid valve 25, which are powered, to be opened；
4) high pressure compressor individually heats circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four-way changes
Logical to the end a of valve 7 and b termination, the end c of four-way reversing valve 7 and d termination are logical, 1 no power of low pressure compressor, and high pressure compressor 2 is logical
Electricity operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20,
Ten solenoid valves 21 and the 14th solenoid valve 25, which are powered, to be opened；
5) high and low pressure compressor parallel refrigeration cycle: 7 no power of four-way reversing valve of the refrigerant circulation loop A, four
The end a of logical reversal valve 7 and d termination are logical, and the end b of four-way reversing valve 7 and c termination are logical, and low pressure compressor 1 and high pressure compressor 2 are logical
Electricity operation, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20, the tenth solenoid valve 21 and the tenth
Four solenoid valves 25, which are powered, to be opened；
6) high and low pressure compressor parallel heating circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, four-way
The end a of reversal valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are powered
Operation, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve the 20, the tenth
Solenoid valve 21 and the 14th solenoid valve 25, which are powered, to be opened；
7) Two-stage Compression heating circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, four-way reversing valve 7
The end a and b termination are led to, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are powered and run, and first
Electric expansion valve 8, the second electric expansion valve 9, the first solenoid valve 12, second solenoid valve 13, the 5th solenoid valve 16, the 6th solenoid valve
18, the 9th solenoid valve 20, the tenth solenoid valve 21 and the 13rd solenoid valve 24, which are powered, opens；
8) heating of high and low pressure compressor parallel mode-defrosting circulation: the four-way commutation of the refrigerant circulation loop A
Valve 7 is powered, and the end a of four-way reversing valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, low pressure compressor 1 and high pressure
Compressor 2, which is powered, to be run, the second electric expansion valve 9, third solenoid valve 14, the 4th solenoid valve 15, the 16, the 8th electricity of the 5th solenoid valve
Magnet valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 14th solenoid valve 25, which are powered, to be opened；
9) heating of low pressure compressor isolated operation mode-defrosting circulation: the four-way commutation of the refrigerant circulation loop A
Valve 7 is powered, and the end a of four-way reversing valve 7 and b termination are led to, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 is powered transports
Row, 2 no power of high pressure compressor, the second electric expansion valve 9, third solenoid valve 14, the 4th solenoid valve 15, the 5th solenoid valve 16,
8th solenoid valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 14th solenoid valve 25, which are powered, to be opened；
10) Two-stage Compression mode heating-defrosting circulation: the four-way reversing valve 7 of the refrigerant circulation loop A is powered, and four
The end a of logical reversal valve 7 and b termination are logical, and the end c of four-way reversing valve 7 and d termination are logical, and low pressure compressor 1 and high pressure compressor 2 are logical
Electricity operation, the first electric expansion valve 8, the second electric expansion valve 9, the first solenoid valve 12, third solenoid valve 14, the 4th solenoid valve
15, the 5th solenoid valve 16, the 8th solenoid valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23 and the 13rd solenoid valve 24 are powered
It opens.
The working method of cooling in summer operating condition:
In refrigerant circulation loop part A, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve the 16, the 7th
Solenoid valve 18, the 9th solenoid valve 20, the tenth solenoid valve 21, the 14th solenoid valve 25, which are powered, to be opened, 7 no power of four-way reversing valve,
The end a and d termination are led in four-way reversing valve 7, the end b and c termination lead to.The high temperature and high pressure gaseous refrigerant that low-pressure stage compressor 1 is discharged
By the first check valve 26 and high pressure stage compressor 2, high temperature and high pressure gaseous refrigerant is discharged through four-way reversing valve 7, the second electromagnetism
Valve 13 is respectively through the 5th solenoid valve 16, the 7th solenoid valve 18 flow into the first outdoor heat exchanger 5, the second outdoor heat exchange 6 was condensed into
Cold high-pressure refrigerant working medium, the high-pressure refrigerant working medium of supercooling flow into the through the 9th solenoid valve 20 and the tenth solenoid valve 21 respectively
Two electric expansion valves, 9 reducing pressure by regulating flow becomes low-temp low-pressure liquid and gaseous state mix refrigerant working medium, then passes through the 14th solenoid valve
25,4 evaporation endothermic of indoor heat exchanger is flowed into, becomes low-temp low-pressure gaseous refrigerant working medium after heat absorption and distinguishes through four-way reversing valve 7
Low-pressure stage compressor 1, high pressure stage compressor 2 are flowed into through second one-way valve 27, third check valve 28.
In process of refrigerastion, when indoor cooling load is smaller, high and low pressure compressor can isolated operation, low pressure compressor 1
When isolated operation, 12 no power of the first solenoid valve, low-temp low-pressure gaseous refrigerant working medium flows into low pressure pressure through second one-way valve 27
Contracting machine 1, the gaseous refrigerant working medium for becoming high temperature and pressure after compressor compresses flow into four-way electromagnetic commutation through the first check valve 26
Valve 7；When 2 isolated operation of high pressure compressor, 12 no power of the first solenoid valve, low-temp low-pressure gaseous refrigerant working medium is unidirectional through third
Valve 28 flows into high pressure compressor 2, flows into four-way electromagnetic as the gaseous refrigerant working medium of high temperature and pressure after compressor compresses and changes
To valve 7.When indoor cooling load is larger, high and low pressure compressor can parallel running, 12 no power of the first solenoid valve, low at this time
Warm low-pressure gaseous refrigerant working medium separately flows into low pressure compressor 1 and high pressure compressed through second one-way valve 27, third check valve 28
Machine 2, the gaseous refrigerant working medium for becoming high temperature and pressure after compressor compresses flow into four-way electromagnetic reversing valve 7.
The working method of transition season heating operating condition:
In refrigerant circulation loop part A, the second electric expansion valve 9, second solenoid valve 13, the 5th solenoid valve the 16, the 7th
Solenoid valve 18, the 9th solenoid valve 20, the tenth solenoid valve 21, the 14th solenoid valve 25, which are powered, to be opened, and four-way reversing valve 7 is powered, and four
The end a and b terminate the logical, end c in logical reversal valve 7 and d termination is logical.The high temperature and high pressure gaseous refrigerant warp that low-pressure stage compressor 1 is discharged
It crosses the first check valve 26 and flows into indoor heat exchange through four-way reversing valve 7 with the discharge high temperature and high pressure gaseous refrigerant of high pressure stage compressor 2
Device 4 condenses heat release and is depressured and is saved by the second electric expansion valve 9 through the 14th solenoid valve 25 at the high-pressure refrigerant working medium of supercooling
Low-temp low-pressure liquid and gaseous state mix refrigerant working medium are flowed into, enters the by the 9th solenoid valve 20, the tenth solenoid valve 21 respectively
Become low-temp low-pressure gaseous refrigerant working medium respectively through the 5th solenoid valve after one outdoor heat exchanger 5, the heat absorption of the first outdoor heat exchanger 6
16, the 7th solenoid valve 18 flows to four-way reversing valve 7 through second solenoid valve 13, unidirectional by second respectively by four-way reversing valve 7
Valve 27, third check valve 28 return to low pressure compressor 1, high pressure compressor 2.
In the operation of transition season heating operating condition, high-low pressure compressor can take high-low pressure pressure according to the case where actual load
Contracting machine isolated operation mode and the high-low pressure compressor parallel method of operation.
The working method of transition season heating defrosting operating condition:
In refrigerant circulation loop part A, the second electric expansion valve 9, which is powered, to be opened, third solenoid valve 14, the 4th solenoid valve
15, the 5th solenoid valve 16, the 8th solenoid valve 19, the 9th solenoid valve 20, the 12nd solenoid valve 23, the energization of the 14th solenoid valve 25 are opened
It opens, four-way reversing valve 7 is powered, and the end a and b terminate the logical, end c in four-way reversing valve 7 and d termination is logical.1 high temperature and pressure of low pressure compressor
Exhaust enters 6 heat release of the second outdoor heat exchanger through the 12nd solenoid valve 23 and defrosts, and cryogenic high pressure refrigerant is through the 8th solenoid valve 29
Flow to the first capillary 10 decompression throttling, low-temperature low-pressure refrigerant and through the 5th solenoid valve 16 from the first outdoor heat exchanger 5
Refrigerant mixing enters hot water storage tank 30 through the 4th solenoid valve 15 and absorbs heat, and then flows to four-way reversing valve 7 through third solenoid valve 14,
Low pressure compressor 1, high pressure compressor 2 are returned to through second one-way valve 27, third check valve 28 respectively by four-way reversing valve 7, it is high
The exhaust of 2 high temperature and pressure of compressor is pressed, indoor heat exchanger 4 is flowed into through four-way reversing valve 7 and condenses heat release into the high-pressure refrigerant of supercooling
Working medium, through the 14th solenoid valve 25, by the decompression throttling of the second electric expansion valve 9 at low-temp low-pressure liquid and gaseous state hybrid refrigeration
Agent working medium flows to 5 evaporation endothermic of the first outdoor heat exchanger through the 9th solenoid valve 20, through the 5th solenoid valve 16 and through the first capillary
The 10 refrigerant mixing from the second outdoor heat exchanger 6, enter hot water storage tank 30 through the 4th solenoid valve 15 and absorb heat, then through third
Solenoid valve 14 flows to four-way reversing valve 7, is returned to respectively by second one-way valve 27, third check valve 28 by four-way reversing valve 7
Low pressure compressor 1, high pressure compressor 2.
The working method of winter outdoor environment temperature heating operating condition when being lower than -5 DEG C:
In refrigerant circulation loop part A, the first electric expansion valve 8, the second electric expansion valve 9, which are powered, to be opened, the first electricity
Magnet valve 12, second solenoid valve 13, the 5th solenoid valve 16, the 7th solenoid valve 18, the 9th solenoid valve 20, the tenth solenoid valve the 21, the tenth
Seven solenoid valves 28, which are powered, to be opened, and four-way reversing valve 7 is powered, and the end a and b terminate the logical, end c in four-way reversing valve 7 and d termination is logical.It is low
The high-temperature high-pressure refrigerant for pressing compressor 1 to be discharged is through the first solenoid valve 12 and passes through the 13rd solenoid valve 24, the 4th check valve 29
The overheat gaseous refrigerant working medium mixing excluded from flash vessel 3, realization is intermediate not exclusively cooling, into high pressure compressor 2, from height
The high-temperature high-pressure refrigerant working medium for pressing compressor 2 to be discharged, enters the room 4 heat release of heat exchanger through four-way electromagnetic reversing valve 7, from interior
The cryogenic high pressure refrigerant liquid that heat exchanger 4 flows out, through the first electric expansion valve 8, refrigerant air-liquid after first time reducing pressure by regulating flow
Mix refrigerant working medium enters flash vessel 3, and the gaseous refrigerant working medium after refrigerant air-liquid mix refrigerant working medium shwoot is through
13 solenoid valves 24, the 4th check valve 29 are mixed with the refrigerant working medium that low pressure compressor 1 is discharged flows to high pressure compressor 2, dodges
Decompression cooling liquid refrigerant becomes low-temp low-pressure liquid refrigerant through the decompression of 9 second throttle of the second electric expansion valve in steaming device 3
Working medium flows to the first outdoor heat exchanger 5 through the 9th solenoid valve 20, the tenth solenoid valve 21 respectively, the evaporation of the second outdoor heat exchanger 6 is inhaled
Heat, then four-way reversing valve 7 is flowed to through second solenoid valve 13 through the 5th solenoid valve 16, the 7th solenoid valve 18 respectively, then single through second
1 air entry of low pressure compressor is flowed to valve 27.
The working method of heating defrosting operating condition when winter outdoor environment temperature is lower than -5 DEG C:
In refrigerant circulation loop part A, the first electric expansion valve 8, the second electric expansion valve 9, which are powered, to be opened, the first electricity
Magnet valve 12, third solenoid valve 14, the 4th solenoid valve 15, the 5th solenoid valve 16, the 8th solenoid valve 19, the 9th solenoid valve the 20, the tenth
Two solenoid valves 23, the 13rd solenoid valve 24, which are powered, to be opened, and the end a and b terminate the logical, end c in four-way reversing valve 7 and d termination is logical.Low pressure
A part of high-temperature high-pressure refrigerant that compressor 1 is discharged is unidirectional through the first solenoid valve 12 and by the 13rd solenoid valve the 24, the 4th
The mixing of overheat gaseous refrigerant working medium that valve 29 is excluded from flash vessel 3, realize it is intermediate not exclusively cooling, into high pressure compressor 2,
The high-temperature high-pressure refrigerant working medium being discharged from high pressure compressor 2, enters the room 4 heat release of heat exchanger through four-way electromagnetic reversing valve 7, from
The cryogenic high pressure refrigerant liquid that indoor heat exchanger 4 flows out, through the first electric expansion valve 8, refrigerant after first time reducing pressure by regulating flow
Gas-liquid mixed refrigerant working medium enters flash vessel 3, the gaseous refrigerant working medium after refrigerant air-liquid mix refrigerant working medium shwoot
It is mixed through the 13rd solenoid valve 24, the 4th check valve 29 with the refrigerant working medium that low pressure compressor 1 is discharged and flows to high pressure compressor
2, the interior decompression cooling liquid refrigerant of flash vessel 3 is depressured through 9 second throttle of the second electric expansion valve, is flowed to through the 9th solenoid valve 20
First indoor heat exchanger, 5 evaporation endothermic and the refrigerant to defrost in the second outdoor heat exchanger 6 through the first capillary 19 mixing
Through the 4th solenoid valve 15, into absorbing heat in hot water storage tank 30, then refrigerant working medium flows to four-way commutation through second solenoid valve 13
Valve 7, then 1 air entry of low pressure compressor, the exhaust of 1 another part high temperature and pressure of low pressure compressor, warp are flowed to through second one-way valve 27
12nd solenoid valve 23 flows to heat release in the second outdoor heat exchanger 6 and defrosts, and then refrigerant working medium is flowed to through the 8th solenoid valve 19
The decompression throttling of first capillary 11, and mixed from the first outdoor heat exchanger 5 through the refrigerant of the 5th solenoid valve 16, through the 4th electricity
Magnet valve 15, into absorbing heat in hot water storage tank 30, then refrigerant working medium flows to four-way reversing valve 7 through third solenoid valve 14, then passes through
Second one-way valve 29 flows to 1 air entry of low pressure compressor.
Solar heat-preservation is added by hot gas bypass between grade, realizes uninterrupted heat supply defrosting, and make the system for having removed frost
Cryogen and energy storage heat exchanger heat exchange realize defrosting refrigerant working medium overheat, improve compressor displacement, and be able to maintain lower pressure
Contracting ratio and delivery temperature.Uninterrupted heat supply defrosting and outdoor heat exchanger may be implemented by the parallel arrangement of outdoor heat exchanger
It defrosts in turn.
A specific embodiment of the invention is only one embodiment, not exhaustive, and those skilled in the art are without creation
Property labour simple copy and improvement still fall within the range that the claims in the present invention are protected.
Claims (4)
1. a kind of solar heat-preservation type Two-stage Compression air source heat pump system, including low pressure compressor (1), high pressure compressor (2),
Flash vessel (3), indoor heat exchanger (4), four-way reversing valve (7), the first electric expansion valve (8), the second electric expansion valve (9),
One solenoid valve (12), the 13rd solenoid valve (24), the 14th solenoid valve (25), the first check valve (26), second one-way valve (27),
Third check valve (28), the 4th check valve (29), characterized in that further include by the first outdoor heat exchanger (5), the second outdoor heat exchange
Device (6), the first capillary (10), the second capillary (11), second solenoid valve (13), third solenoid valve (14), the 4th solenoid valve
(15), the 5th solenoid valve (16), the 6th solenoid valve (17), the 7th solenoid valve (18), the 8th solenoid valve (19), the 9th solenoid valve
(20), the refrigeration that the tenth solenoid valve (21), the 11st solenoid valve (22), the 12nd solenoid valve (23) and connecting refrigerant lines are constituted
Agent circulation loop A and mouth (33), hot water outlet are filled by hot water storage tank (30), solar thermal collector (31), water pump (32), cold water
(34) and water route connecting tube constitute solar energy heating, accumulation of heat water-flow circuit B；The connection of the refrigerant circulation loop A
Structure is that low pressure compressor (1) upper end refrigerant line is connected through the first check valve (26) with the end a of four-way reversing valve (7), low
Pressure compressor (1) lower end refrigerant line is connected through second one-way valve (27) with the end c of four-way reversing valve (7), four-way reversing valve
(7) the end b refrigerant line is connected with indoor heat exchanger (4) upper port, indoor heat exchanger (4) lower port refrigerant line
Through the 14th solenoid valve (25), the second electric expansion valve (9) are connected to the 9th solenoid valve (20), the tenth solenoid valve (21) is connected in
The middle part e point of refrigerant line, the middle part e point left side refrigerant line of refrigerant line is through the 9th solenoid valve (20) and the first Room
External heat exchanger (5) lower end is connected, through the tenth solenoid valve (21) and the second outdoor heat exchanger on the right side of the middle part e point of refrigerant line
(6) lower end is connected, and the 5th solenoid valve (16) of the first outdoor heat exchanger (5) top is connected to the 5th solenoid valve (16) and the 7th electromagnetism
Valve (18) is connected in the middle part f point of refrigerant line, and the 7th solenoid valve (18) of the second outdoor heat exchanger (6) top is connected to refrigeration
The middle part f point of agent pipeline, the middle part f point of refrigerant line are connected to the end d of four-way reversing valve (7) through second solenoid valve (13), high
Pressure compressor (2) upper end refrigerant line is connected on the pipeline that the first check valve (26) is connected with the end a of four-way reversing valve (7),
High pressure compressor (2) lower end refrigerant line is connected to second one-way valve (27) and four-way reversing valve (7) through third check valve (28)
The connected refrigerant pipe road in the end c, flash vessel (3) upper end refrigerant line is through the 13rd solenoid valve (24), the 4th check valve
(29) the g point for the refrigerant line that high pressure compressor (2) is connected with third check valve (28), flash vessel (3) right end refrigeration are connected to
Agent pipeline through the first electric expansion valve (8), be connected to the refrigerant line that indoor heat exchanger (4) is connected with the 14th solenoid valve (25)
On, flash vessel (3) lower left quarter refrigerant line is connected to the connected refrigeration of the 14th solenoid valve (25), the second electric expansion valve (9)
On agent pipeline, the first solenoid valve (12) upper end refrigerant line is connected to what low pressure compressor (1) was connected with the first check valve (26)
The h point of refrigerant line, the first solenoid valve (12) lower end refrigerant line are connected to high pressure compressor (2) and third check valve (28)
The i point of connected refrigerant line, the 8th solenoid valve (19) right end are connected to the second outdoor heat exchanger (6) upper end and the 7th solenoid valve
(18) connected refrigerant pipe road, the 8th solenoid valve (19) the first capillary of left end (11) be connected to the 7th solenoid valve (18) with
The connected refrigerant pipe road of the middle part f point of refrigerant line, the 6th solenoid valve (17) left end be connected to the 5th solenoid valve (16) with
The connected refrigerant pipe road in first outdoor heat exchanger (5) top, the 6th solenoid valve (17) right end connect through the second capillary (11)
The refrigerant pipe road being connected to the 5th solenoid valve (16) with the middle part f point of refrigerant line, the 11st solenoid valve (22) left end
It is connected to the refrigerant pipe road that the first outdoor heat exchanger (5) is connected with the 9th solenoid valve (20), the 11st solenoid valve (22) right end
It is connected to low pressure compressor (1) to be connected with the first check valve (26) the j point of refrigerant line, the 12nd solenoid valve (23) left end is connected to
Second outdoor heat exchanger (6) is connected refrigerant pipe road with the tenth solenoid valve (21), and the 12nd solenoid valve (23) right end is connected to the
11 solenoid valves (22) are connected refrigerant pipe with low pressure compressor (1) on the road, and third solenoid valve (14) left end is connected to hot water storage tank
(30) upper right side, third solenoid valve (14) right end are connected to the refrigeration that second solenoid valve (13) is connected with the end d of four-way reversing valve (7)
On agent pipeline, the 4th solenoid valve (15) left end is connected to hot water storage tank (30) lower-left end, and the 4th solenoid valve (15) right end is connected to second
Solenoid valve (13) is connected refrigerant pipe with the middle part f point of refrigerant line on the road；The solar energy heating, accumulation of heat water are recycled back to
The connection structure of road B is: solar thermal collector (31) left end is connected through water pump (32) with the lower-left end of hot water storage tank (30), the sun
Energy heat collector (31) right end is connected with hot water storage tank (30) left upper end, and cold water fills into mouth (33) and hot water storage tank (30) lower part phase
Even, hot water outlet (34) is connected with hot water storage tank (30) top.
2. solar heat-preservation type Two-stage Compression air source heat pump system described in accordance with the claim 1, characterized in that described is low
It presses compressor (1) and high pressure compressor (2) is frequency conversion or variable conpacitance compressor.
3. solar heat-preservation type Two-stage Compression air source heat pump system described in accordance with the claim 1, characterized in that described
One outdoor heat exchanger (5) and the second outdoor heat exchanger (6) parallel configuration.
4. solar heat-preservation type Two-stage Compression air source heat pump system described in accordance with the claim 1, it is characterized in that: its operation side
Method includes the following contents:
1) low pressure compressor separate refrigeration recycles: four-way reversing valve (7) no power of the refrigerant circulation loop A, four-way change
Lead to the end a of valve (7) and d termination, the end b of four-way reversing valve (7) and c termination are logical, and low pressure compressor (1) is powered runs, high pressure
Compressor (2) no power, the second electric expansion valve (9), second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve
(18), the 9th solenoid valve (20), the tenth solenoid valve (21) and the 14th solenoid valve (25), which are powered, opens；
2) high pressure compressor separate refrigeration recycles: four-way reversing valve (7) no power of the refrigerant circulation loop A, four-way change
Logical to the end a of valve (7) and d termination, the end b of four-way reversing valve (7) and c termination are logical, low pressure compressor (1) no power, high pressure pressure
Contracting machine (2), which is powered, to be run, the second electric expansion valve (9), second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve
(18), the 9th solenoid valve (20), the tenth solenoid valve (21) and the 14th solenoid valve (25), which are powered, opens；
3) low pressure compressor individually heats circulation: the four-way reversing valve (7) of the refrigerant circulation loop A is powered, four-way commutation
The end a of valve (7) and b termination are led to, and the end c of four-way reversing valve (7) and d termination are logical, and low pressure compressor (1) is powered runs, high pressure pressure
Contracting machine (2) no power, the second electric expansion valve (9), second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve (18),
9th solenoid valve (20), the tenth solenoid valve (21) and the 14th solenoid valve (25), which are powered, to be opened；
4) high pressure compressor individually heats circulation: the four-way reversing valve (7) of the refrigerant circulation loop A is powered, four-way commutation
The end a of valve (7) and b termination are logical, and the end c of four-way reversing valve (7) and d termination are logical, low pressure compressor (1) no power, high pressure compressed
Machine (2) be powered operation, the second electric expansion valve (9), second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve (18),
9th solenoid valve (20), the tenth solenoid valve (21) and the 14th solenoid valve (25), which are powered, to be opened；
5) high and low pressure compressor parallel refrigeration cycle: four-way reversing valve (7) no power of the refrigerant circulation loop A, four-way
The end a of reversal valve (7) and d termination are logical, and the end b of four-way reversing valve (7) and c termination are logical, low pressure compressor (1) and high pressure compressor
(2) be powered operation, second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve (18), the 9th solenoid valve (20), the tenth
Solenoid valve (21) and the 14th solenoid valve (25), which are powered, to be opened；
6) high and low pressure compressor parallel heating circulation: the four-way reversing valve (7) of the refrigerant circulation loop A is powered, and four-way changes
Logical to the end a of valve (7) and b termination, the end c of four-way reversing valve (7) and d termination are logical, low pressure compressor (1) and high pressure compressor
(2) be powered operation, the second electric expansion valve (9), second solenoid valve (13), the 5th solenoid valve (16), the 7th solenoid valve (18), the
Nine solenoid valves (20), the tenth solenoid valve (21) and the 14th solenoid valve (25), which are powered, to be opened；
7) Two-stage Compression heating circulation: the four-way reversing valve (7) of the refrigerant circulation loop A is powered, four-way reversing valve (7)
The end a and b termination are led to, and the end c of four-way reversing valve (7) and d termination are logical, and low pressure compressor (1) and high pressure compressor (2) are powered and transport
Row, the first electric expansion valve (8), the second electric expansion valve (9), the first solenoid valve (12), second solenoid valve (13), the 5th electromagnetism
Valve (16), the 6th solenoid valve (18), the 9th solenoid valve (20), the tenth solenoid valve (21) and the energization of the 13rd solenoid valve (24) are opened
It opens；
8) heating of high and low pressure compressor parallel mode-defrosting circulation: the four-way reversing valve (7) of the refrigerant circulation loop A
Be powered, the end a of four-way reversing valve (7) and b termination are logical, and the end c of four-way reversing valve (7) and d termination are logical, low pressure compressor (1) and
High pressure compressor (2), which is powered, to be run, the second electric expansion valve (9), third solenoid valve (14), the 4th solenoid valve (15), the 5th electricity
Magnet valve (16), the 8th solenoid valve (19), the 9th solenoid valve (20), the 12nd solenoid valve (23) and the 14th solenoid valve (25) are powered
It opens；
9) heating of low pressure compressor isolated operation mode-defrosting circulation: the four-way reversing valve of the refrigerant circulation loop A
(7) it is powered, the end a of four-way reversing valve (7) and b termination are logical, and the end c of four-way reversing valve (7) and d termination are logical, low pressure compressor (1)
Be powered operation, high pressure compressor (2) no power, the second electric expansion valve (9), third solenoid valve (14), the 4th solenoid valve (15),
5th solenoid valve (16), the 8th solenoid valve (19), the 9th solenoid valve (20), the 12nd solenoid valve (23) and the 14th solenoid valve
(25) it is powered and opens；
10) Two-stage Compression mode heating-defrosting circulation: the four-way reversing valve (7) of the refrigerant circulation loop A is powered, four-way
The end a of reversal valve (7) and b termination are logical, and the end c of four-way reversing valve (7) and d termination are logical, low pressure compressor (1) and high pressure compressor
(2) be powered operation, the first electric expansion valve (8), the second electric expansion valve (9), the first solenoid valve (12), third solenoid valve
(14), the 4th solenoid valve (15), the 5th solenoid valve (16), the 8th solenoid valve (19), the 9th solenoid valve (20), the 12nd solenoid valve
(23) it is powered and opens with the 13rd solenoid valve (24).
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